Pavement grinder



J. c. HAM

PAVEMENT GRINDER March 27, 1928. 1,663,759

Filed Dec. 29. 1924 2 Sheets-Sheet 1 J 7 20 4 4 a] 13 l a 38 I9 InuenTm"Jacob 0. Hum

t i J 4 2 Sheets-Sheet 2 J. C. HAM

PAVEMENT GRINDER Flled Dec 29 1924 March 27, 1928.

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Patented Mar. 27, 1923.

UNITED STATES PATENT OFFICE.

PAVEMENT GRINDER.

' jA ppll'catlon filed December 29, 1924. Serial no. 758,752.

This-invention relates to 'a road grinding or dressing deviceparticularly designed and adapted for use in removing any roughnessor'projections which at spots extend upwardly from concrete roads orpavements. In the laying of concrete roads or pavements the finishedpavement,.after it has been laid and struck'as smooth'as possible, manytimes has rough spotsleft or upwardly pro ecting knobs,,i'hich-i'nfiorder to make "the road sm'ootlras it'should he, need to beremoved. It is the primary object and purpose of my invention to providea simple, practical and easily operated attachment which can be appliedto andidriven-by a Fordson tractor and by means of which the rough spotson the surface of a road or pavement may be quickly and rapidly smoothedt0 the desired condition.

For an understanding of the invention and structures {which I havedesigned to embody the same, reference may be had to the followingdescription taken in connection with the accompanying drawings in which,

Fig. 1 isa side elevation showing my pavement or road grinder'atta'chedto and operated by a Fordson tractor.

Fig. 2 is a plan view thereof.

Fig. 3 is a plan 'view with parts broken away and in section of theimmediate finishing or grinding disk.

Fig. 4: is aside elevation thereof, partly in section. a

Fig.5 is an enlarged fragmentary side elevation of the frontend of theattachment with parts broken away and in section to show the interiorconstruction. I

Fig. 6 is 'a fragmentary enlarged side elevation of the road finishingor grind ng attachment, and I Fig. 7 is an elevation of one of thedressing star wheels, a plurality of which are used at a riumber'ofdifferent points on the grinding or dressing disk.

Like reference characters refer to like parts in the different figuresof the drawings.

The tractor .1' is of the well-known and usual Fordson construction. Ithas a front axle 2 on which, near one of the wheels mounted thereon, abracket 3 is permanently secured, the same being re-inforced andstrengthened against turning by brace rods 4 extending therefromrearwardly to a relatively fixed part of the tractor. The bracket hasupper and lower spaced apart forwardly projecting arms 5 eachterminating in a vertical sleeve through which a shaft 6 passes, thesame also passing through and being keyed to a pulley 7, which islocated between said sleeves on the upper and lower arms 5. At the upperend of the shaft 6 a ipcond pulley 8 is mounted, as best shown in A'relatively wide arm 9 of metal at its rear end is formed with spacedapart upper and lower rearwardly extending portions 10, each terminatingin a collar through which the shaft 6 passes so that this arm 9 ismounted for pivotal movement on and about the vertical axis of the shaft6. At its front end arm 9 is -formed with upper and lower spaced apartforwardly projecting portions 11, similar to the parts 10, whichlikewise terminate in collars and through which a vertical shaft 12passes, the shaft being se cured against rotation in one or both of saidcollars.

A second arm 13 is located in front of and extends from the arm 9, atits'rear end being formed with spaced apart upper and lower sleeves 14,the lower one of which lies above the lower part 11 and the upper, belowthe upper part 11, as shown. in Fig. 6. The shaft 12 passes through saidsleeve 14. The pulleys 15 and 16, the one above the other, are rotatablymounted on the shaft 12, the upper pulley 15 being in horizontalalignment with the pulley 7 before described.

At its front end arm 13 is formed with an upper sleeve 17 and a lo ersleeve 18 spaced a distance apart, a shaft 19 passing freely throughsaid sleeves and also through a pulley 20 placed between the sleeves andwhich is splined on shaft 1 so that the shaft may be given a limi ed upand down movement. A collar 21 is pinned to the upper end of shaft 19and beers upon a ball bearing 22. which in turn rests upon a secondcollar v23 loose on the shaft 19 and normally bearing against the upperend of thesleeve 1.7. A yoke 24 is connected with the collar 23, beingformed at the rear end of a hand lever 25 which is pivotaliy mounted at26 between its ends on a forwardly and up- \vardly curved arm 27integral with the sleeve 17. It is apparent that by moving he handleportion 25 toward the arm 27, shaft 19 and any mechani m-attachedthereto may be elevated a limited distance and the arm 27 and lever 25are conveniently located that this operation may be manually performedat any time desired; and by holding the lever 25 against the arm 27 theshaft 19 will be held in elevated osition.

At the lower end of t e shaft 19 a universal joint coupling 28 issecured on which a disk 29 is mounted at its lower end, said disknormall being positioned horizontal. This disk is ormed with a pluralityof rectangular openings 30 cut therethrou h, the lengths of which aredisposed perpen icular to radii of the disk. Within each of the openingsat number of star wheels 31 are mounted side by side being rotatable onpins 32 mounted transversely of the openings 30 and releasably held inposition by set screws 33. It is apparent that on loosening any setscrew a pin may be moved outwar 1y so as to dismount the star wheelsthereon, this being desirable for replacement of the star wheels whenthey become worn and useless. The star wheels shown are a well-knownform of dressing member used for dressing the faces or peripheries ofemery, carborundum or other grinding wheels.

A shaft 34 connected with and driven by the engine of the tractorextends laterally from one side of said tractor and is provided speed.The star wheel dressing me with a drive pulley 35, shown in Figs. 1 and2, which serves to drive a twisted belt 36 which passes around thepulley 8 before described. A second belt 37 passes around pulleys 7 and15 and a third belt 38 around the pulleys 16 and 20. These beltconnections between the tractor engine and the shaft 19 serve to drivesaid shaft 19 and the disk 29 connected therewith at a higlllrate ofbars or cutters 31, lowered to the upper surface of the road orpavement, act on any rou hened or projecting portions thereof, quicklydressing and cutting the same down smoothly to the level of thepavement. When the star wheels become worn to such an extent that theyare no longer se iceable they ma be removed and replace by new ones. ena spot has been smoo hed or dressed down as much as required, haft 19with the attached disk 29 is elev ted by operatin the lever 25 and thetractor may be mov to a new position.

It is evident that the pivotal mounting of arm 19 on shaft 6 and,thepivotal mounting of arm 13 on shaft 12 gives the disk 29 a considerablerange of movement so that the position of the tractor does not need tobe continuously changed even thou h the rough spots to be dressed may be0 considerable area. This grinder or dressing attachment has proved veryserviceable in actual prac-' a plurality of relatively wide slots outthere'- in, the lengths of which are perpendicular to radii of the disk,and a plurality of star wheel dressing elements located side b side androtatably mounted in each slot, su stantially as described.

2. In a device of the class described, the combination with a rotatableshaft of a disk fixed at its axis to said shaft and having a pluralityof relatively wide slots out therethrough,,a plurality of shafts eachextending from the periphery of said! disk and passing through eachrespective slot, and a plurality of star wheel dressing elements.located in each slot and rotatably mounted on each res tive shafttherein.

3. In a evice of the class described, the combination with a rotatableshaft of a disk fixed at its axis to said shaft and having a pluralityof relatively wide slots out therethrough, a pluralit ing from the peripcity of the disk through each respective slot therein and removablysecured to the disk, anii a plurality of star wheel dressing elementslocated in each slot and rotatably mounted" on each respective shafttherein.

In testimony whereof I affix my signature.

JACOB c. HAM.

of shafts each extend-'

